HA540 MK2 Headphone Amp
WARNING: THE MINIMUM HEADPHONE IMPEDANCE FOR THE
HA540 IS 8 OHMS. THE MAXIMUM HEADPHONE IMPEDANCE IS 2000
OHMS.
DO NOT OPEN THE HA540. REMOVING THE UNITS COVER COULD
POTENTIALLY DAMAGE THE UNIT OR CAUSE HARM TO UNQUALI-
FIED PERSONS. THE UNIT OPERATES AT +150 VOLTS INSIDE.
HIGH VOLTAGES EXIST INSIDE THE UNIT EVEN WHEN THE UNIT
IS NOT POWERED ON. ALL WARRANTIES ARE VOID IF ANY INTER-
NAL COMPONENTS ARE DAMAGED DUE TO USER ERROR.
SPECIFICATIONS
Input Impedance: 47K ohms
Max Output Gain: 19.6 dB
THD: 0.04%, 20Hz-20KHz, at 1V RMS
S/N Ratio: 85 db, unweighted
Indicator: 1 Power LED
Max Output Power: 332 mW/side, 664 mW/Channel (30 Ohms)
Frequency Response: 6 Hz - 51 KHz +/- 3 db
Phase Shift (In to Out): 0 Deg.
Crosstalk: -75 dB
Headphone impedance: 8 Ohms to 2000 Ohms
Input Connectors: CH 1: RCA, 1/8" (3.5mm)Stereo; CH 2: RCA
Outputs: 1: 1/4" TRS Stereo jack
1: 1/8" (3.5 mm) TRS Stereo jack
PWR: 15 VDC 500mA
Size: 6"w x 2.5"h x 5.4"d
Weight: 2 lb.
headphone amplifier
HA540 MK2
MADE IN USA
Volume
input 1
input 2
Power
Input select
power
HA540 MK2
Headphone
MADE IN USA
Connection guide
Salt Lake City, UT
12/18
WARNING
USING THIS PRODUCT AT EXCESSIVE VOLUMES CAN CAUSE
PERMANENT HEARING DAMAGE.
USE AS LOW A VOLUME AS POSSIBLE
In order to use this system safely, avoid prolonged listening at excessive sound pressure
levels. Please use the following guidelines established by the Occupational Safety Health
Administration (OSHA) on maximum time exposure to sound pressure levels before hearing
damage occurs. 90 dB SPL at 8 hours
95 dB SPL at 4 hours
100 dB SPL at 2 hours
105 dB SPL at 1 hour
110 dB SPL at 1/2 hour
115 dB SPL at 15 minutes
120 dB SPL - avoid or damage may occur
CAUTION: Plugging a mono 1/4” or 1/8” TS plug into the Headphone Out-
puts on the HA540 will cause permanent damage to the unit because one side
would be shorted to ground. Never plug a mono plug into any of the Head-
phone Outputs THE HA540 WILL BE PERMANENTLY DAMAGED
Tip
Sleeve
(ground)
Tip
Ring
Sleeve
(ground)
This is a MONO
jack and should
never be plugged
into the Head-
phone Output of
a HA540.
This is a TRS or
stereo jack that
is compatible
with the HA540
Headphone
Outputs.
The warning section of the manual. Boring, but
hey we care about your hearing and health.
